Allergic Rhinitis

(Hay Fever; Seasonal Allergies)

Definition

Allergic rhinitis is the set of symptoms that occurs when you breathe in substances you are allergic to. These substances are called allergens and are small proteins.

Seasonal (intermittent) allergic rhinitis (sometimes called hay fever or rose fever)—This occurs during times of the year when allergens are in the air, like spring, summer, and fall. The most common allergens are tree, grass, or weed pollens.

Perennial (persistent) allergic rhinitis—This condition is caused by allergens that may be present year round. These may include chemicals, dust, dust mites, cockroaches, animal dander, or mold spores. Symptoms may be present any time of year.

Causes

An allergic reaction occurs when your body's immune system overreacts to an allergen. When you breathe in an allergen, cells in your nasal passages release a chemical called histamine. Histamine causes your nose to feel itchy. Histamine also causes swelling and mucus production in the nasal passages.

Site of Histamine Production

This area has swelling and increased mucus production after contact with an allergen.

Diagnosis

Your doctor will try to find out which allergens you are allergic to. You may be referred to an allergist or immunologist. This is a doctor who specializes in allergies.

Tests may include:

Skin Prick Test

A tiny bit of an allergen is placed under the skin with a needle. The doctor watches to see if the skin in that area becomes red, raised, and itchy. This can be done for multiple allergens at the same time.

RAST Testing

A small sample of blood is taken and tested for different allergens.

Provocation Testing

You breathe in air containing an allergen. The doctor will watch to see if you have an allergic reaction, such as wheezing or trouble breathing. This test is usually reserved for research settings.

Treatment

The most effective way to treat allergies is to avoid the allergen. Since this can sometimes be difficult or impossible, other treatments are available.

Treatments may include:

Medications

Topical corticosteroids—Nasal sprays that decrease swelling in the nasal passages

Mast cell inhibitors—Nasal sprays that interfere with the chemical reactions leading to histamine release

Antihistamines—Block the action of histamine; available as nasal spray, pill, or syrup

Decongestants—Decrease congestion by constricting blood vessels; taken as pills or as a nasal spray

Note: Using a nasal spray may lead to rebound congestion.

Immunotherapy (Allergy Shots) and Sublingual Therapy

With immunotherapy, very small amounts of allergens are injected over weeks, months, or even years. The goal is to make your body's immune system less sensitive to those allergens. This treatment may be effective in reducing or eliminating the symptoms of allergic rhinitis.

Another similar treatment called
sublingual immunotherapy involves placing small amounts of allergens under the tongue. This treatment is more popular in Europe and is not approved in the United States. While it has shown to reduce symptoms in some studies, more research is needed.

If you are diagnosed with allergic rhinitis, follow your doctor's
instructions.

If you are diagnosed with allergic rhinitis, follow your doctor's
instructions.

Prevention

The following strategies may help
prevent allergic rhinitis:

Stay inside during the morning hours when pollen counts are highest.

Avoid outside activities during the time of year when the trees, grasses, weeds, or molds are blooming.

Keep the windows of your house and car closed to keep pollen out.

Use an air conditioner to reduce indoor humidity and to prevent mold and mildew growth.

Clean your air conditioner's filters regularly.

Consider running an air purifier in your home, especially in your bedroom.

Use vacuum cleaners and air conditioners with HEPA filters to trap allergens.

Revision Information

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

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